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There are 17 fifteen-letter words containing A, C, H, 3O and 2T

AUTOCHTHONOUSLYautochthonously adv. In an autochthonous manner.
AUTOCHTHONOUS adv. indigenous, aboriginal, also AUTOCHTHONAL, AUTOCHTHONIC.
CHEMOAUTOTROPHSchemoautotrophs n. Plural of chemoautotroph.
CHEMOAUTOTROPH n. any organism, e.g. bacteria, that produces energy by the oxidation of inorganic compounds, such as iron, ammonia and hydrogen sulphide, also CHEMOAUTROPH.
CHEMOAUTOTROPHYchemoautotrophy n. (Biology) A mode of growth in which CO2 is the exclusive source of assimilated carbon, and energy is…
CHEMOAUTOTROPHY n. the production of energy by the oxidation of inorganic compounds, such as iron, ammonia and hydrogen sulphide.
CHEMOTAXONOMISTchemotaxonomist n. One who studies chemotaxonomy.
CHEMOTAXONOMIST n. one who practises chemotaxonomy.
CHROMATOLOGISTSCHROMATOLOGIST n. a specialist in chromatology.
COMPOTATIONSHIPCOMPOTATIONSHIP n. being a drinking companion.
CYTOPATHOLOGIEScytopathologies n. Plural of cytopathology.
CYTOPATHOLOGY n. the study of cells in illness.
CYTOPATHOLOGISTcytopathologist n. A scientist whose speciality is cytopathology.
DICHOTOMISATIONdichotomisation n. Alternative spelling of dichotomization.
DICHOTOMISATION n. the act of dichotomising, also DICHOTOMIZATION.
DICHOTOMIZATIONdichotomization n. The act of dichotomizing or the thing dichotomized; classification into 2 subsets (that is, a dichotomy);…
DICHOTOMIZATION n. the act of dichotomizing, also DICHOTOMISATION.
HISTOPATHOLOGIChistopathologic adj. Of or pertaining to histopathology.
HISTOPATHOLOGIC adj. relating to histopathology.
ORTHOCHROMATISMorthochromatism n. Quality of being orthochromatic.
ORTHOCHROMATISM n. the state of being orthochromatic, of photographic film, sensitive to all colours except red.
ORTHODONTICALLYorthodontically adv. By orthodontic means.
ORTHODONTIC adv. relating to orthodontics, the rectification of crookedness in the teeth.
PHOTODISSOCIATEphotodissociate v. To cause, or to undergo photodissociation.
PHOTODISSOCIATE v. to effect photodissociation, dissociation produced by the absorption of radiant energy.
PHOTOEXCITATIONphotoexcitation n. (Chemistry) The formation of an excited state by the absorption of a photon.
PHOTOEXCITATION n. the process of exciting the atoms or molecules of a substance by the absorption of radiant energy.
PHOTOTROPICALLYphototropically adv. In a phototropic manner.
PHOTOTROPIC adv. relating to phototropism, movement directed by light.
THANATOGNOMONICthanatognomonic adj. Foreshadowing death.
THANATOGNOMONIC adj. indicating or characteristic of death.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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See this list for:

  • English Wiktionary: 117 words
  • Scrabble in French: 7 words
  • Scrabble in Spanish: 3 words
  • Scrabble in Italian: 4 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 3 words


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